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| 1/3 VEFT1-SMT Dual Output Series Dc-Dc Converter Rev. 11-2005 Description Designed to convert fixed voltages into an isolated voltage, the VEFT1-SMT dual series is well suited for providing board-mount local supplies in a wide range of applications, including mixed analog/digital circuits, test & measurement equip., process/machine controls, datacom/telecom fields, etc... The semi-regulated output can be followed by 3-terminal regulators to provide output protection, in addition to output regulation. Model Number VEFT1-S5-D5-SMT VEFT1-S5-D9-SMT VEFT1-S5-D12-SMT VEFT1-S5-D15-SMT VEFT1-S12-D5-SMT VEFT1-S12-D9-SMT VEFT1-S12-D12-SMT VEFT1-S12-D15-SMT VEFT1-S15-D5-SMT VEFT1-S15-D9-SMT VEFT1-S15-D12-SMT VEFT1-S15-D15-SMT VEFT1-S24-D5-SMT VEFT1-S24-D9-SMT VEFT1-S24-D12-SMT VEFT1-S24-D15-SMT Input Voltage Nominal 5 Vdc 5 Vdc 5 Vdc 5 Vdc 12 Vdc 12 Vdc 12 Vdc 12 Vdc 15 Vdc 15 Vdc 15 Vdc 15 Vdc 24 Vdc 24 Vdc 24 Vdc 24 Vdc Features *Isolated 1 W output *Temperature range: -40C~+85C *Unregulated *High efficiency to 80% *Dual voltage output *Small footprint *SMD package style *Industry standard pinout *UL94-V0 package *No heatsink required *3K Vdc isolation *Power density 0.85 W/cm *No external component required *Low cost Output Voltage 5 Vdc 9 Vdc 12 Vdc 15 Vdc 5 Vdc 9 Vdc 12 Vdc 15 Vdc 5 Vdc 9 Vdc 12 Vdc 15 Vdc 5 Vdc 9 Vdc 12 Vdc 15 Vdc Output Current Max. 100 mA 56 mA 42 mA 33 mA 100 mA 56 mA 42 mA 33 mA 100 mA 56 mA 42 mA 33 mA 100 mA 56 mA 42 mA 33 mA Min. 10 mA 6 mA 5 mA 4 mA 10 mA 6 mA 5 mA 4 mA 10 mA 6 mA 5 mA 4 mA 10 mA 6 mA 5 mA 4 mA Efficiency 72% 75% 78% 79% 74% 76% 78% 79% 74% 75% 79% 79% 79% 80% 80% 80% Package Style SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD UL60950-1 YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO NO Range 4.5~5.5 Vdc 4.5~5.5 Vdc 4.5~5.5 Vdc 4.5~5.5 Vdc 10.8~13.2 Vdc 10.8~13.2 Vdc 10.8~13.2 Vdc 10.8~13.2 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 13.5~16.5 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc 21.6~26.4 Vdc Note: 1. All specifications measured at TA=25C, humidity <75%, nominal input voltage and rated output load unless otherwise specified. Output Specifications Item Output power Line Regulation Load Regulation Output voltage accuracy Temperature drift Output ripple Switching frequency Test conditions For Vin change of 1% 10% to 100% full load See tolerance envelope graph @ 100% load 20 MHz Bandwidth Full load, nominal input 50 100 Min. 0.1 10 Typ. Max. 1 1.2 15 0.03 75 Units W % % %/C mVp-p KHz V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062 www.v-infinity.com 1-866-372-1258 2/3 VEFT1-SMT Dual Output Series Dc-Dc Converter Rev. 11-2005 General Specifications Short circuit protection Temperature rise at full load Cooling Operating temperature range Storage temperature range Soldering temperature Storage humidity range Case material Safety MTBF Burn-in <1 second 25C Max, 15C Typ. Free air convection -40C to +85C -55C to +125C 300C (1.5mm from case for 10 sec.) <95% Plastic (UL94-V0) approved to UL60950-1 (E222736) >3,500,000 hrs. Full load at +85C, for 4 hours at no-load and 4 hours at full load. Isolation Specifications Item Isolation Voltage Insulation Resistance Test Conditions Tested for 1 min. Test at 500 Vdc Min. 3000 1000 Typ. Max. Units Vdc M Typical Characteristics Outline Dimensions & Recommended Layout Pattern Side View 15.24 6.0 1.85MA X 7.0 6.7 0 A 0.50 1.50 1.20 A 0.3 5.00 Top View 15.24 7.62 Pin 1 2 3 5 6 -Vin +Vin NC COM -Vout 1 2 11 1 0 87 Pin 7 8 10 11 12 NC +Vout NC NC NC 11.2 7.5 MAX 1 23 56 Note: All Pins on a 2.54mm pitch; all pin diameters are 0.50mm; all dimensions in mm. V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062 www.v-infinity.com 1-866-372-1258 3/3 VEFT1-SMT Dual Output Series Dc-Dc Converter Rev. 11-2005 Application Notes: - Input filtering To reduce the reflected ripple current and minimize EMI, especially when the converter input is more than 2" away from the DC source, it is recommended to connect a low ESR electrolytic capacitor between Vin and Gnd. The values suggested are as shown in Table 1. If additional filtering is required, the capacitance may be increased, or expanded to an LC network as shown in Figure 1. - Minimum loading The converter needs a minimum of 10% loading to maintain output regulation. Operation under no-load conditions will not cause immediate damages but may reduce reliability, and cause performance not to meet specifications. - Regulation With a semi-regulated design, the converter's output voltage varies with load current and will change proportionally to the input voltage. If regulated output is needed, an external regulator can be used as shown in Figure 2. Table 1 Input Voltage 5V 12 V 15 V 24 V - Output filtering An output capacitor is needed to meet output ripple requirements as shown in Table 2. Output capacitance may be increased for additional filtering, but should not exeed 10F or expanded to an LC network as in Figure 1. External Input Capacitance 4.7 F 2.2 F 2.2 F 1.0 F - Protection The converter has minimal protection against input over-voltage or output over-load, and may be permanently damaged if exposed to these conditions. An input clamping device can be used for input voltage limiting. An input fuse or an output fuse can also be used to protect against over-loading. - Dual outputs used as a single output The +Vout and -Vout can be used to obtain a single output that is the sum of the two outputs. In this case, the COM pin shouldn't be used. - External Regulator An external 3-terminal regulator can be connected to the output of the converter to achieve full regulation. Make sure the converter's output voltage provides sufficient head room for the regulator. An additional benefit is that the built-in protection features in the regulator, such as OCP, OTP, etc, will protect the converter also. In a complimentory supply, a negative output regulator must be used to achieve the negative regulated output. +Vout Table 2 Vout 5V 9V 12 V 15 V 24 V External Ouput Capacitance 10 F 4.7 F 2.2 F 1 F 0.47 F +Vin -Vin +Vin C L L REG REG DC DC DC DC +Vout C L C REG REG COM -Vout +Vout COM REG REG -Vin DC DC COM -Vout +Vin -Vin DC DC DC DC -Vout V-Infinity, LLC, 20050 SW 112th Ave., Tualatin, OR 97062 www.v-infinity.com 1-866-372-1258 |
Price & Availability of VEFT1-S12-D12-SMT
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